Woocommerce - Allow Postcodes with Particular Prefix

I'm looking for a way to only allow delivery to postcodes that begin with a particular string.

I know how to only allow particular postcodes by listing them in functions.php, but I don't have an entire list, only the prefixes of the post codes I wish to allow.

Any thoughts on how I can allow only postcodes that begin with a set prefix?

via Chebli Mohamed